Graft Choices in ACL Surgery – Hamstring vs Patellar vs Quad Tendon

Anterior cruciate ligament (ACL) reconstruction is one of the most commonly performed knee surgeries worldwide. When the ACL is torn and surgery is recommended, one of the most important decisions involves choosing the right graft. The graft replaces the damaged ligament and plays a major role in knee stability, recovery time, and long-term outcomes.

Among the available options, hamstring tendon, patellar tendon, and quadriceps tendon grafts are the most widely used. Each graft has its own advantages, limitations, and ideal indications. Understanding the differences helps patients make informed decisions along with their orthopedic surgeon.

Why Graft Choice Matters in ACL Surgery

The success of ACL reconstruction depends on several factors, including surgical technique, rehabilitation, and graft selection. The graft serves as a scaffold that eventually integrates with the bone and functions like a new ligament.

Different grafts vary in strength, healing time, donor site discomfort, and impact on knee function. There is no single “best” graft for all patients. Instead, the choice depends on age, activity level, sport type, knee anatomy, and surgeon expertise.

Types of Grafts Used in ACL Reconstruction

Autograft vs Allograft

ACL grafts are broadly classified into autografts and allografts. Autografts are taken from the patient’s own body, while allografts come from donor tissue. In young and active individuals, autografts are generally preferred due to lower failure rates.

This blog focuses on the three most common autograft options: hamstring tendon, patellar tendon, and quadriceps tendon.

Hamstring Tendon Graft

The hamstring graft is typically harvested from the semitendinosus and sometimes gracilis tendons. These tendons are folded to create a strong graft for ACL reconstruction.

Advantages of Hamstring Graft

• Less pain at the front of the knee
• Smaller surgical incision
• Lower risk of kneeling pain
• Good cosmetic outcome

Limitations of Hamstring Graft

• Possible reduction in hamstring strength
• Slower graft fixation to bone
• Slightly higher risk of graft stretching in some cases

Hamstring grafts are commonly recommended for recreational athletes and patients who frequently kneel or squat.

Patellar Tendon Graft

The patellar tendon graft, also known as the bone–patellar tendon–bone graft, involves taking the middle portion of the patellar tendon along with small bone blocks from the kneecap and shin bone.

Advantages of Patellar Tendon Graft

• Strong and reliable graft strength
• Excellent bone-to-bone healing
• Lower risk of graft stretching
• Preferred choice for high-demand athletes

Limitations of Patellar Tendon Graft

• Anterior knee pain
• Pain while kneeling
• Risk of patellar fracture or tendon irritation

Patellar tendon grafts are often chosen for professional athletes or individuals involved in high-impact, pivoting sports.

Quadriceps Tendon Graft

The quadriceps tendon graft is taken from the tendon above the kneecap. It can be harvested with or without a bone block, depending on surgical preference.

Advantages of Quadriceps Graft

• Thicker and stronger graft
• Less kneeling pain compared to patellar graft
• Lower donor site pain than patellar tendon
• Suitable for revision ACL surgery

Limitations of Quadriceps Graft

• Temporary quadriceps weakness
• Limited long-term data compared to other grafts
• Requires surgical expertise

The quadriceps tendon graft is increasingly popular and is often used in revision surgeries or when other grafts are unsuitable.

Comparison of Graft Options

Strength and Stability

All three grafts provide excellent strength and stability when properly placed. Patellar and quadriceps grafts are generally considered slightly stronger initially, while hamstring grafts rely more on soft tissue healing.

Donor Site Morbidity

Hamstring grafts have less front knee pain, patellar grafts have higher kneeling discomfort, and quadriceps grafts offer a balance between strength and reduced anterior knee pain.

Rehabilitation and Recovery

Rehabilitation timelines are similar across graft types, but muscle-specific strengthening varies. Hamstring graft patients focus on hamstring recovery, while patellar and quadriceps graft patients emphasize quadriceps strengthening.

How Surgeons Decide the Best Graft

Surgeons consider multiple factors when selecting a graft:

• Age and activity level
• Type of sport or occupation
• Knee anatomy and previous surgeries
• Risk of re-injury
• Patient preference

A personalized approach ensures optimal outcomes and long-term knee health.

Long-Term Outcomes and Success Rates

Studies show that all three graft types have excellent long-term success rates when combined with proper surgical technique and rehabilitation. Graft failure is more closely related to return-to-sport timing and rehabilitation quality than graft choice alone.

Conclusion

Choosing the right graft in ACL surgery is a critical decision that influences recovery, comfort, and performance. Hamstring, patellar, and quadriceps tendon grafts each have unique benefits and limitations.

The best graft is not the same for everyone. A thorough discussion with an experienced orthopedic surgeon helps align graft choice with lifestyle, activity goals, and long-term knee health, ensuring the best possible surgical outcome.